# bloomberg/comdb2

Bloomberg's distributed RDBMS

Repository: https://github.com/bloomberg/comdb2
Canonical: https://ross.abutalabs.com/products/comdb2
Language: C
License: NOASSERTION
License Family: other
Last push: 2026-08-26T19:32:53+00:00

## Health v2 (maintenance only)
Score: 77/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 35, longevity 100
- inputs: {"age_days": 3395, "days_push": 7, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1528, forks 241 (observed 2026-08-28T04:04:58.620810+00:00)

## What it is
Comdb2 is Bloomberg's open-source clustered relational database management system built on optimistic concurrency control. It supports multiple isolation levels including snapshot and serializable, with clients transparently connecting to the lowest-latency node and reconnecting on failure.

## Use cases
- run a distributed SQL database across a cluster of machines
- need snapshot or serializable isolation in a relational database
- transparent failover and reconnect for database clients
- self-hosted alternative to commercial clustered RDBMS
- low-latency transactional reads and writes on any cluster node

## When to choose
- you need a clustered RDBMS with strong isolation guarantees
- you want transparent client failover across database nodes
- you're comfortable running and operating your own database infrastructure

## When to avoid
- you need a mainstream database with a large ecosystem and community
- you require managed cloud database services
- your workload is a simple single-node application where SQLite or Postgres suffices

## Facets
- artifact type: application
- maturity: active
- function: database, caching, concurrency
- domain: databases, microservices, backend, developer-tools
- platform: cross-platform
- tags: rdbms, distributed-database, sql, optimistic-concurrency, clustered-database, bloomberg, linux, macos

## Member repositories
- bloomberg/comdb2 (main) score 77

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:58.620810+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:31:30.429882+00:00, confidence not recorded.
  - readme: https://github.com/bloomberg/comdb2 (fetched 2026-08-28T04:04:58.620810+00:00, sha 76fa6922eaa1)
- Data as of 2026-08-30T08:39:29.467469+00:00.